2,10-Dibromo-6,6-dimethyldibenzo[d,f][1,3]dioxepine
نویسندگان
چکیده
In the crystal structure of the title compound, C(15)H(12)Br(2)O(2), which was synthesized from 2,10-dibromo-2,2'-dihydroxy-biphenyl and 2,2-dimethoxy-propane, the aromatic rings are twisted by 35 (1)°. The heterocyclic ring exhibits a twisted conformation.
منابع مشابه
2,2′-Bi[6,6′-dimethyldibenzo[d,f][1,3]dioxepine]
The title compound, C(30)H(26)O(4), is a dimer of 6,6'-dimethyl-dibenzo[d,f][1,3]dioxepine linked by formation of a C-C bond in the para position with respect to one O atom. The dimer is arranged around an inversion centre. As is usually observed in related compounds, the dibenzo group is twisted, the two benzene rings making a dihedral angle of 41.56 (9)°. The seven-membered ring exhibits a tw...
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In the crystal structure of the title compound, C(18)H(18)Br(2)O(2), the two benzene rings of the bridged biphenyl unit are twisted by 38.0 (1)°.
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Starting from 2,2'-dihydroxybiphenyl and an allenic ester, the title dibenzo-condensed dioxepine derivative was synthesized using a one-pot procedure.
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In the title compound, C(18)H(16)Br(2)O(2), the dihedral angle between the aromatic rings is 35.55 (17)° and the cyclohexyl ring adopts a chair-like conformation. In the crystal, molecules are linked by van der Waals forces.
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Treatment of the protected and unprotected nucleosides with 1,3-dibromo-5,5- dimethylhydantoin in aprotic solvents such as CH(2)Cl(2), CH(3)CN, or DMF effected smooth bromination of uridine and cytidine derivatives at C-5 of pyrimidine rings as well as adenosine and guanosine derivatives at C-8 of purine rings. Addition of Lewis acids such as trimethylsilyl trifluoromethanesulfonate enhanced ef...
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